Nasmyth–Cassegrainn.

Brit.

/ˌneɪsmɪθˈkasᵻˌɡreɪn/, U.S.

/ˈneɪˌsmɪθˈkæsəˌɡreɪn/

Origin: Formed within English, by compounding. Etymons: Nasmyth n., Cassegrain at Cassegrainian adj.

Etymology: < Nasmyth n. (see sense 2 s.v.) + Cassegrain at Cassegrainian adj.

Astronomy.

An altazimuth reflecting telescope in which light from a Cassegrain secondary mirror is reflected by a tertiary plane mirror through 90 degrees, to be brought to an external focus at the side of the tube at its lower end.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > reflecting telescopes

reflecting telescope1672

reflector1735

speculum1789

Herschelian telescope1792

Newtonian1820

reflector telescope1840

Cassegrain1888

Nasmyth1960

Nasmyth–Cassegrain1972

the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes

stellascope1661

Schmidt camera1934

Schmidt1939

Maksutov–Cassegrain1958

Maksutov1970

Nasmyth–Cassegrain1972

Schmidt telescope1978

Dobsonian1980

1972 Jrnl. Brit. Astron. Assoc. 82 436 A simple device which I have designed and constructed for my 300 mm Nasmyth-Cassegrain overcomes these problems.

1988 Astronomer 25 106 La Palma WHT 4,2 m Nasmyth Cassegrain.

This is a new entry (OED Third Edition, June 2003; most recently modified version published online March 2022).

单词	nasmyth–cassegrain
释义	Nasmyth–Cassegrainn. Brit. /ˌneɪsmɪθˈkasᵻˌɡreɪn/, U.S. /ˈneɪˌsmɪθˈkæsəˌɡreɪn/ Origin: Formed within English, by compounding. Etymons: Nasmyth n., Cassegrain at Cassegrainian adj. Etymology: < Nasmyth n. (see sense 2 s.v.) + Cassegrain at Cassegrainian adj. Astronomy. An altazimuth reflecting telescope in which light from a Cassegrain secondary mirror is reflected by a tertiary plane mirror through 90 degrees, to be brought to an external focus at the side of the tube at its lower end. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > reflecting telescopes reflecting telescope1672 reflector1735 speculum1789 Herschelian telescope1792 Newtonian1820 reflector telescope1840 Cassegrain1888 Nasmyth1960 Nasmyth–Cassegrain1972 the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes stellascope1661 Schmidt camera1934 Schmidt1939 Maksutov–Cassegrain1958 Maksutov1970 Nasmyth–Cassegrain1972 Schmidt telescope1978 Dobsonian1980 1972 Jrnl. Brit. Astron. Assoc. 82 436 A simple device which I have designed and constructed for my 300 mm Nasmyth-Cassegrain overcomes these problems. 1988 Astronomer 25 106 La Palma WHT 4,2 m Nasmyth Cassegrain. This is a new entry (OED Third Edition, June 2003; most recently modified version published online March 2022). < n.1972
随便看	empty word empty-basketed empty-bellied empty-eyed empty-fisted empty-handed empty-headed empty-headedness empty-hearted empty-netter empty-panelled empty-pated empty-skulled empty-stomached empty-vaulted emptybasketed emptybellied emptyeyed emptyfisted emptyhanded emptyheaded emptyheadedness emptyhearted emptying emptyings